1. General Description

2. Technical Specifications

2.1 Hydraulic Parameters

• Rated Flow: 110–150 L/min (at 210 bar/3000 psi, refer to flow curve)

• Max Operating Pressure:

  • Ports P, A, B: 350 bar (5000 psi)

  • Port T (without Y): 50 bar (725 psi); (with Y): 350 bar (5000 psi)

• Fluid Compatibility: Mineral oil-based hydraulic fluids (DIN 51524 parts 1–3)

• Fluid Viscosity: 15–45 mm²/s (recommended); 5–400 mm²/s (allowable)

• Cleanliness Class: NAS 1638 Class 6 / ISO 4406 15/12 or better

• Leakage: <1.5 L/min (neutral position)

2.2 Electrical Parameters

• Supply Voltage: 24 VDC (22–28 VDC)

• Max Current Consumption: 1.2 A

• Input Command Signals:

  • Voltage: 0 to ±10 VDC (input resistance 50 kΩ)

  • Current: 0 to ±10 mA (load resistance 200 Ω); 4 to 20 mA (load resistance 200 Ω)

• Feedback Signal: 4–20 mA (spool position, load resistance 300–500 Ω)

• Protection Class: IP65 (with mating connector)

2.3 Mechanical & Environmental

• Mounting Pattern: ISO 4401-03-03-0-05

• Weight: 2.5 kg (5.51 lb)

• Temperature Range:

  • Ambient: -20 °C to +60 °C (-4 °F to +140 °F)

  • Fluid: -20 °C to +80 °C (-4 °F to +176 °F)

• Vibration Resistance: 30 g, 3-axis, 10 Hz–2 kHz

• Shock Resistance: 50 g, 6 directions, 3 ms

3. Operation Principle

4. Installation Instructions

4.1 Mechanical Installation

1. Mounting Surface: Ensure flatness ≤0.02 mm/100 mm and roughness Ra <1 μm.

2. Mounting Bolts: Use M5×60 DIN 912 (10.9/12.9 grade), torque to 8.5–10 N·m.

3. Port Connection: Align P (inlet), T (return), A/B (actuator ports), and Y (drain) ports; replace O-rings if damaged.

4. Installation Position: Any orientation (fixed or moving).

4.2 Electrical Wiring

1. Connector: 6+PE-pin DIN 43563 (metal housing, IP65).

2. Pin Assignment:

   • Pin A: 24 VDC Power

   • Pin B: 0 V (Ground)

   • Pin C: Not Used

   • Pin D: Command Signal (Voltage/Current)

   • Pin E: Inverted Command (Voltage/Current)

   • Pin F: Spool Position Feedback (4–20 mA)

   • PE: Protective Ground

3. Cabling: Use twisted, shielded cables; connect shield to 0 V (power supply side) and connector housing for EMC.

5. Commissioning & Adjustment

5.1 System Flushing

• Flush the hydraulic system before operation to achieve ISO 4406 15/12 cleanliness.

• Flush with a flushing plate (replace valve) at operating temperature; minimum flushing time: t=5V/Q (V=reservoir volume, Q=pump flow).

5.2 Electrical Null Adjustment

1. Remove the pan head screw on the electronics housing to access the 4-turn null potentiometer.

2. With 0 command signal, adjust the potentiometer until flow null is achieved (no flow between A/B and T).

3. Reinstall the screw after adjustment.

6. Maintenance

• The valve is maintenance-free under normal operating conditions.

• Replace system filters regularly (β10 ≥75, 10 μm absolute) to maintain fluid cleanliness.

• Inspect seals and connectors periodically for leaks or damage.

7. Troubleshooting

8. Safety Precautions

• Only trained personnel should install/repair the valve.

• Depressurize the hydraulic system before disassembly.

• Do not exceed maximum pressure ratings to prevent valve damage or injury.

• Use only MOOG-authorized repair facilities; unauthorized repair voids the warranty.